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Post by tintin62 on Dec 31, 2007 15:46:33 GMT
Have fitted new brakes hoses to my 900, dismantled and rebuilt the calipers with new seals, but am struggling to get the brakes bled. Am bleeding from the master cylinder in traditional style, but just can't get a good pressure from the brake lever, and keep getting air bubbles. I must have been through a full bottle of brake fluid nearly already.
Have left it 24 hours as well and tried again this afternoon, bit of improvement but not massive.
Any suggestions to help would be appreciated.
Thanks
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Post by HRHpenfold on Dec 31, 2007 16:23:00 GMT
I find it easy to do with a large syringe connected to a short piece of pipe, then connected to the bleed nipple and forced up into the master cylinder, then bled as normal, allways works for me, in about 20 miniuts, or you could splash out on the proper mytec brake bleeder
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Post by Padster on Dec 31, 2007 19:05:55 GMT
Mityvac brake bleeders are brilliant. It makes the process really quick and easy.
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Post by HRHpenfold on Dec 31, 2007 19:47:48 GMT
Mityvac brake bleeders are brilliant. It makes the process really quick and easy. thats the one I meant ;D |
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Post by eliminator on Dec 31, 2007 20:04:20 GMT
tintin62,
I had the same problem after fitting seals & hoses. I couldn't get the last bit of air out of the system. The pistons had moved out & nearly pushed the pads against the discs. In the end I unbolted the calipers & pushed the pistons fully home, this got rid of a lot of the air. Then after applying the lever, it was a case of leaving the lever tied back, whilst I tapped the hoses, for a while small bubbles came out. Left it tied back overnight. bloomin boring job.
Cheaper then buying a Mityvac ;D
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Post by teejayexc on Dec 31, 2007 20:07:31 GMT
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Post by tintin62 on Jan 1, 2008 13:41:45 GMT
Thanks for the advice, managed to complete the task this morning, did not need anything more that patience in the end.
Pumped the brake lever to build up some pressure, then released the nipple to bleed off the pressure quickly, this seemed to dislodge lots of small bubbles which came out over about half an hour of doing this repeatedly, now lever is solid.
Will take it for MOT now, ride it around a bit and bleed it again after its been shaken up a bit, just to be sure.
Have a good new year.
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Post by CD on Mar 7, 2008 22:25:12 GMT
Large syringe (50ml ideal) and tying backl the lever work for me. Bled the bluespots and new hoses in 30mins then tied lever back. Lever was solid 2 hours later.
Sorted.
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Post by Ol' Greasy Dave on Apr 23, 2009 9:43:09 GMT
Having just rebuilt the brakes on the 900 I just bought - patience is the key
just pull the brake lever in with one finger until you hear a faint click & you'll notice little bubbles coming up - keep on doing this for as long as it takes (took me about 40 mins)
DON'T PULL THE LEVER ALL THE WAY IN you're just filling up the cylinder & hoses with air
what you're actually doing is back bleeding the system - all that's left is the air actually near (or in) the calipers & that's purged with the bleeder nipples
I've used this method on clutches & brakes on trucks & cars for more years than I'll admit to.
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